Check to make sure your Region is set to your country rather than "custom".Apple Menu > Language&Text > Formats > Region > Your Country (Like United States)

__Test iCal

Make an iCal backup, File > Export > Archive.

Remove the following to the trash and restart your computer:Home > Library > Caches > com.apple.ical or icalHome > Library > Calendars > Calendar Cache, Cache, Cache 1, 2, 3, etc. (Do not remove Sync Cache or Theme Cache)Home > Library > Preferences > com.apple.ical (There may be more than one of these. Remove them all.)__NOTE: Removing these files will remove any shared (CalDAV) calendars you may have access to. You will have to re-add those calendars to iCal > Preferences > Accounts.

Have repeated the process described above. Emptied the trash and rebooted.

Unpublished all my calendars.Deleted all my calendars.Re-imported all my calendars from the above-mentioned archives.Unpublished, deleted and trashed everything a second time.Re-entered items into an empty incarnation of iCal, by hand.

All with negative results.

Can enter new Events/To-Dos.Can change anything that has a pop-up, a check box or a date field.Can add/delete invitees.Can edit Location field.

CAN NOT edit the title field.The only way to change it is to delete the entire event/do-do and re-enter a new one.

This creates two problems:

1) Can't correct misspellings or make changes to the title. If you published calendars, you can not correct them and have the corrections propagate to your subscribers unless you delete the event and re-enter it by hand. IF you have other data such as invitees, descriptions, attachments, etc. ALL this data needs to be re-entered by hand. This creates a lot of work when all you want to do is update a mistake or make a minor change in the title.

2) If you publish your calendars and you auto-update them, the auto-update feature closes the event/to-do for editing every time it updates. Once that initial edit-entry session has closed, you can NOT re-edit.So... IF you are entering a new item, auto-update shuts you out and you can not re-edit. You have to delete the item and re-enter it from the beginning.

Otherwise, you have to shut off auto-update and hope you don't make a mistake in typing, double check and triple check your work BEFORE you close the initial edit-entry session. Then you have to turn auto-update back on then pray that nobody comes along and wants you to make changes.

_Export each local calendar out as it's own ics file by clicking on each one one at a time to highlight and then going to File > Export > Export._Delete all the calendars but one - Edit > Delete_Add a new calendar - File > New Calendar_Delete the remaining old calendar_Try adding / changing events -- does it work?

If so close and re-open iCal to ensure the old calendars do not come back.

_Now add each of the calendars back in by opening up each ics file you created 1 at a time and added to a "New Calendar".

Come on Apple.. there is a malfunction in ical all coming around the same time...I have this problem too and it just happened two days ago. Virus maybe to new software some people uploaded?? What is going on? I can't edit anything in the calender but I can post to do notes on the side. I dod not change any of the settings, it just locked down.........

I have not used iCal very much in the past because I have been using other apps that do almost the same thing. However, I decided to try iCal again because I wanted better consolidation of e-mail, address book, calendar and to-do lists. I am disappointed to find that iCal does not work as expected, when I expect it to work.

Do I think it's due to a virus or something? No!

Do I think Apple is behind the ball? Yes!

I would very much like to, at least, hear that somebody is paying attention to the problem and that a solution is in the works if not forthcoming.

Somebody needs to get in front of the ball! I needed iCal to work "yesterday." I do not want to have to take the time to undo all my work in iCal and redo it, once again, using another solution. I do not have time to trifle with such details.

I'm having a similar problem. I double click an event on my calendar and the event editor does not appear. If I hit the F10 key, the editor comes forward, but it disappears when I lift my finger from the F10 key. When I choose Hide Others from the iCal menu, the editor window does not show. Also, I must delete the event and re-enter it to edit its name, as others in this thread have noted. It's not just a problem with being able to edit. I can't even bring the editor window out to read it unless I depress and hold the F10 key. I haven't tried any of the fixes that have been suggest because it seems that they didn't help. Any other suggestions??

I'm also having the same problem. I've tried everything that's been suggested in this post and others (i.e. deleted cache files and preferences, removed duplicate fonts from Font Book, etc) but I still cannot edit any text in existing iCal events. I can add events without issue, and can change the time of existing iCal events. But, no text editing is possible.

I'm also in the same boat- I deleted all caches, and pref files, etc. as mentioned and it worked fine lat night, but tonight, I'm back in the same place. I get a message- "This calendar was created by Mail." yadda yadda yadda.

I am only able to add events through either iPhone, iPad, or my Mobile Me. NOT from my desktop, which is where I would like to add them.

I was able to solve my issue. It was a duplicate fonts problem. Font Book wasn't even recognizing that I had an issue with Lucida Grande. I reinstalled Snow Leopard from the original disks. Then ran software updates. The new install found the duplicate font problem and that solved the issue for me.

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